Cortinarius vibratilis (no English name exists) is a rare fungus standing on the Red List of vulnerable and threatened species !
Its rusty-brown cap is edible, but beware : this is probably the most bitterly tasting fungus on earth !
Dutch name : Gele Galgordijnzwam
German name : Bitterster Schleimfuss (auch Galliger Schleimfuss genannt)
Latin name : Cortinarius vibratilis